Assessment of two-stage hyper- and thermophilic anaerobic co-digestion of briquetted wheat straw and liquid fraction of digestate

IF 5.6 1区 农林科学 Q1 AGRICULTURAL ENGINEERING Industrial Crops and Products Pub Date : 2024-10-29 DOI:10.1016/j.indcrop.2024.119863
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Abstract

Due to the high resistance of lignocellulosic biomass to anaerobic digestion, the application of an appropriate pre-treatment method is an unavoidable step before subjecting the material to anaerobic digestion (AD). Thus, this study aims to assess a two-stage anaerobic co-digestion of briquetted wheat straw and liquid fraction of digestate under hyper- and thermophilic conditions (65 and 55˚C). Hyperthermophilic AD was applied in the first stage as a pre-digestion step to investigate the impact of increased temperature on the degradation level of lignocellulosic biomass throughout the process. After operating 10 hydraulic retention times the average methane yield was determined to be 248 (±40) L/kgVS with 4 days retention time at hyperthermophilic conditions followed by 14 days thermophilic anaerobic digestion. The methane yield contribution from the briquetted wheat straw was found to be 277 (±26) L/kgVS by subtracting the yield from the liquid fraction of digestate. A mass balance was performed to evaluate the degradability of lignocellulose throughout the process. Hemicellulose and cellulose degradation rates were ∼ 68.7 %, and 68.0 %, respectively for both digestion steps. The experiment reported that two-stage anaerobic co-digestion under hyper- and thermophilic conditions is an attractive strategy for maximizing energy yield from straw by enhancing the lignocellulose degradation and might pose an alternative pre-treatment method of agricultural wastes.
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对压块小麦秸秆和沼渣液体部分的两阶段超热和嗜热厌氧协同消化进行评估
由于木质纤维素生物质对厌氧消化有很强的抵抗力,因此在对材料进行厌氧消化(AD)之前,采用适当的预处理方法是一个不可避免的步骤。因此,本研究旨在评估在超嗜热和嗜热条件(摄氏 65 度和 55 度)下对压块小麦秸秆和沼渣液体部分进行两阶段厌氧共消化的情况。第一阶段采用嗜热厌氧发酵作为预消化步骤,以研究温度升高对整个过程中木质纤维素生物质降解水平的影响。在超嗜热条件下停留 4 天,然后进行 14 天的嗜热厌氧消化,在运行 10 个水力停留时间后,甲烷的平均产量确定为 248 (±40) 升/千克 VS。通过减去沼渣液体部分的甲烷产量,发现压块小麦秸秆的甲烷产量为 277 (±26) L/kgVS。进行了质量平衡以评估整个过程中木质纤维素的降解性。在两个消化步骤中,半纤维素和纤维素的降解率分别为 68.7% 和 68.0%。实验结果表明,在超嗜热和嗜热条件下进行两阶段厌氧协同消化是一种有吸引力的策略,可通过提高木质纤维素降解率来最大限度地提高秸秆的能源产量,并可作为农业废弃物预处理的一种替代方法。
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来源期刊
Industrial Crops and Products
Industrial Crops and Products 农林科学-农业工程
CiteScore
9.50
自引率
8.50%
发文量
1518
审稿时长
43 days
期刊介绍: Industrial Crops and Products is an International Journal publishing academic and industrial research on industrial (defined as non-food/non-feed) crops and products. Papers concern both crop-oriented and bio-based materials from crops-oriented research, and should be of interest to an international audience, hypothesis driven, and where comparisons are made statistics performed.
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